Mitsubishi 20,000 BTU (12K + 12K) GX-Series 20 SEER2 Dual Zone Wall Mount Mini Split Heat Pump System - R454B | 230V

Mitsubishi GX-Series 2-Zone Wall-Mount Mini Split Heat Pump - 12K + 12K

Comfort for two separate rooms from one Mitsubishi multi-zone outdoor condenser. This GX-Series system pairs the MXZ-2D20NL outdoor heat pump with 12K + 12K wall-mounted indoor units for efficient heating and cooling without adding ductwork.

The outdoor system is in Mitsubishi's 20,000 BTU class. For non-ducted indoor combinations like this wall-mount setup, the catalog lists 18,000 BTU cooling, 24,000 BTU heating, 20 SEER2 efficiency, and AHRI certificate 216498925.

This standard heat pump configuration is a strong fit for efficient two-room comfort where extreme low-temperature capacity is not the main design requirement.

At a Glance:

Best For	two rooms where high-efficiency heating and cooling matter, but Hyper Heat output is not required
System Models	MXZ-2D20NL / 2-MSZ-GX12NL
Indoor Combination	12K + 12K
AHRI Non-Ducted Capacity	18,000 BTU cooling / 24,000 BTU heating
Heating Capacity at 5F	13,700 BTU
Efficiency	20 SEER2 / 13.0 EER2 / 10.0 HSPF2
Voltage	208/230V, 1 phase
Refrigerant	R-454B
Controls	Handheld remote included / WiFi built in on GX wall-mounted indoor units
Installation Type	Professional HVAC installation required

Why Choose This Mitsubishi 2-Zone System?

• Two-room comfort: Heat and cool two spaces independently using one outdoor condenser.
• GX wall-mounted indoor units: GX indoor units include handheld remote control capability and built-in WiFi per the catalog.
• Efficient inverter performance: Mitsubishi inverter technology varies output to help maintain steadier comfort than basic on/off equipment.
• Current-generation refrigerant: Built around Mitsubishi's R-454B equipment lineup.
• Clean installation profile: Wall-mounted indoor units avoid ductwork and are well suited for bedrooms, offices, additions, bonus rooms, and other defined spaces.

What Is Included?

• 1 Mitsubishi MXZ-2D20NL outdoor multi-zone heat pump condenser
• 2 Mitsubishi MSZ-GX12NL 12K wall-mounted indoor units
• Handheld remote control capability for each indoor unit

Line-set note: choose a line-set length for each indoor unit. Select None for any zone where you do not want a line set included. Mixed-length line sets are supported; electrical accessories, pads, brackets, disconnects, condensate pumps, and other installation materials may need to be quoted or purchased separately.

Before You Order:

• Have your installer confirm room loads, indoor placement, outdoor placement, line-set routing, electrical requirements, and local code requirements.
• Nominal indoor sizes like 12K + 12K are not a substitute for a Manual J load calculation.
• This is not a DIY quick-connect system. Refrigerant piping, evacuation, electrical work, startup, and commissioning should be handled by a qualified HVAC professional.
• The outdoor condenser is a two-port multi-zone unit, so no branch box is required for this configuration.

Frequently Asked Questions:

Why does the title say 20,000 BTU if the indoor combination is 12K + 12K?
The outdoor unit is Mitsubishi's 20,000 BTU class MXZ-2D20 condenser. The catalog's non-ducted AHRI configuration for this condenser lists 18,000 BTU cooling and 24,000 BTU heating.

Can each room have its own temperature setting?
Yes. Each wall-mounted indoor unit can be controlled separately, subject to normal multi-zone operating limits.

Are line sets included?
Only if you select a line-set package variant. The package options are set up as matching pairs for both zones.

Is this a DIY system?
No. Mitsubishi multi-zone equipment should be installed and commissioned by a qualified HVAC professional.

Specifications:

BRAND NAME	Mitsubishi
SERIES	GX-Series
SYSTEM TYPE	2-zone ductless mini split heat pump
OUTDOOR MODEL	MXZ-2D20NL
INDOOR MODELS	2-MSZ-GX12NL
ZONE CAPACITY	2 zones
AHRI CERTIFICATE NUMBER	216498925
AHRI TYPE	Non-ducted indoor units
COOLING CAPACITY	18,000 BTU
HEATING CAPACITY	24,000 BTU
HEATING CAPACITY AT 5F	13,700 BTU
SEER2	20
EER2	13.0
HSPF2	10.0
REFRIGERANT TYPE	R-454B
POWER SUPPLY	208/230V, 1 phase
OUTDOOR UNIT TYPE	Standard Heat Pump ported multi-zone condenser
REGISTERED WARRANTY	10-year parts and compressor limited warranty when registered within 90 days; terms apply
NON-REGISTERED WARRANTY	5-year parts / 7-year compressor limited warranty; terms apply

Indoor Unit Details:

Indoor Model	Nominal Size	Rated Indoor Capacity	Line Size	Dimensions
2 x MSZ-GX12NL	12K	12,000 BTU cooling / 14,400 BTU heating	1/4 in liquid / 3/8 in gas	11-25/32 in H x 31-13/32 in W x 9-21/32 in D